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GCN Circular 20340

Subject
GRB 161224A: TSHAO optical observations
Date
2016-12-26T13:04:31Z (7 years ago)
From
Alexei Pozanenko at IKI, Moscow <apozanen@iki.rssi.ru>
E. Mazaeva (IKI),  I. Reva (Fesenkov Astrophysical Institute), A. 
Kusakin (Fesenkov Astrophysical Institute), A. Volnova (IKI), A. 
Pozanenko (IKI) report on behalf of larger GRB follow-up collaboration:

We observed the field of GRB 161224A  (Swift trigger=728268, 
Cholden-Brownet al., GCN 20333) with Zeiss-1000 (East) 1-m telescope of 
Tien Shan Astronomical Observatory. We obtained several images in R 
filter starting on Dec. 25 (UT) 00:13:31 and Dec. 25 (UT) 23:45:12. We 
do not detect any evident variable source in the BAT ground-calculated 
position (Ukwatta  al., GCN 20337). Within enhanced XRT position 
(Cholden-Brownet al., GCN 20338) we not detected any source. Preliminary 
photometry of the field is following

Date       UT start   t-T0   Filter   Exp.   OT   Err.  UL
                       (mid, days)     (s)
2016-12-25 00:13:31   0.10201  R      16*180 n/d n/d   21.1
2016-12-25 23:45:12   1.07646  R      11*180 n/d n/d   20.7


Photometry is based on nearby USNO-B1.0 stars
0719-0341418 17.14
0720-0349085 17.50
0720-0348989 16.94
0719-0341338 15.94

A finding chart can be found in 
http://grb.rssi.ru/GRB161224A/GRB161224A_20161225_TSHAO_fc.png
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